Everyone that put in package bees, need to check their bees now for queen acceptance. If you do not see eggs or larvae on the frames your queen probably has not been accepted and you need a new queen. Right now the larvae should be easy to see because they will getting big. There should be eggs and larvae on a couple sides of frames by now. The first delivery beekeepers maybe even be starting to see some capped larvae. If you do not check for queen acceptance and your hive is queenless, the hive will die because they cannot make a new queen for themselves.
Not the greatest egg pics. The bottom pic does show a typical frame. Eggs in the lower two thirds of the frame. The dark multi colored muddy looking substance in the cells is stored pollen. You can also see glistening nectar in the top cells of the frame.